H3 Upgraded Battery

Next time the battery in a H3 Hummer dies, I recommend getting the Optima Battery 8042-218 D75/25 Red Top or Yellow Top instead of a factory replacement. Although, the Optima D75/25 is much bigger than the factory battery and will not fit inside that plastic box… but who cares. Personally, I think the plastic box is just there to add a distraction from the small battery and the non-GM labeling of the battery. So I ditched that factory hummer plastic box that the battery was hiding in side of, and dropped in a much bigger battery in it’s place.  Reason being, the factory battery is under powered and provides only a single set of terminals. My Warn M-8,000lb winch is capable of such extreme power demands that it can easily damage a battery. The alternator will never be capable of keeping up with the demands either. Throttling the engine of H3 Hummer up to 2,500 RPMs helps out with those demands, but again will not keep up. However a bigger battery is just a better all around solution, just don’t forget to still throttle up when winching. The Optima D75/25 has ~33% more power over the factory battery that GM decided to install. That ~33% more power goes a long way with smoothing out the issues of winching. The Optima D75/25 battery has the added benefit of having dual terminals ready to go. I use the Traditional style connections posts on top for the H3 Hummer factory wiring harness. As for […]

Leaky Sunroof H3 Hummer

A few months ago I fixed an issue where the sunroof on my H3 Hummer wouldn’t properly drain the water. Which would make for a surprise after a particularly heavy rain fall. The problem was from going off-road with the Hummer and flinging mud and debris every where with the sunroof wide open. By design, all sun roofs leak which is why they have tubes to drain the water. If the mud and debris is forgotten about and never cleaned out, it tends to get jammed in the tubes. Once the H3 Hummer sunroof tubes are clogged, the water has no way drain out except out of the sunroof and sadly into my lap. Fixing the clogged sunroof drains is a simple process. On the passenger side you need to remove the plastic panel on the side of the dash to gain access to the lower portion of the drain tube that has this bent shape. This lower piece is white and has black grommet on the fire wall to drain the water outside the vehicle. The upper portion is just a flexible black hose. I decided to disconnect the two hoses and use 125 PSI air pressure from a air compressor to blow the dirt and grime back out the way it came in. Be sure to point the other end outside the vehicle, because I didn’t the first time. The plastic cover for the pillars on both the driver and passenger sides I found to be extremely easy […]

H3 Hummer PCM Programming

After some research using the internet on PCM’s and Tuning, I found out that I don’t have the latest tune / reflash from GM for my H3’s 2006 3.5 L (211 CID) L52 I5 cylinder engine. I was able to check my vehicle by using a simple OBDII sensor I have and cross referencing numbers using TIS website by entering the VIN number. I compared the tune number from my previous post P0455 & P0442 ECU Fault Log H3 Hummer where the Vehicle Calibration ID on my vehicle as 12606370. The tune 12606370‘s description mentions that it is for “New software to address customer complaint of cruise being disabled.” Using my VIN number and selecting the option PCM/VCM Powertrain/Vehicle Control Module – Programming I’m able to see that the latest version is 12627884. The description of 12627884 says that it has “New software with driveability and fuel economy improvements achieved by decreasing the time TCC will be unlocked due to a misfire rough road event.” After reading about the improvements, Driveability and Fuel Economy, listed as an GM factory update I decided to get the newer tune from a GM dealership. Having driven on 12627884 for a few months now, I haven’t ever noticed and driveablity changes. The Fuel Economy does feel a bit better, I’d say 5 to 10 more miles per gas tank. Since I didn’t quite get the changes I’m looking for, in the future I’d like to try PCM of NC tune for H3 Hummers for […]

Burnt Out HVAC Instrument Panel Light Bulbs

About year ago in my dashboard a light bulb for controlling the vents went out on my H3 Hummer, making it difficult to see which setting I had the ventilation on. A few months later, I had two light bulbs that didn’t illuminate on my HVAC (Heating, Ventilation, and Air Conditioning) Control Panel which began to make choosing the setting on the instrument panel difficult at night. I called up GM about getting it fix but all they want to do is completely replace the GM Part No. 15840354 CONTROL, A/C Instrument Panel, or with the part ACDelco 15-73909 GM Original Equipment Heating and Air Conditioning Control Panel with Rear Window Defogger Switch. Expensive and very wasteful I found out how to get my hands on the light bulbs from a guy on eBay. Replacing the light bulbs only took about 15 minutes of my time. Now I’m on the hunt to purchase a large quantity of them so that I can sell them to on my websites shop. Begin with putting your finger in the cigarette light socket and put up to release the dash. I know it sounds weird, but trust me it woks amazingly. After which you’ll need to remove four bolts that hold the HVAC Control to the dash with a 7mm socket (or at least that is what I used). I used a 7mm socket to remove the HVAC Control System from the dash panel. I’ve now disconnect the wires so that the HVAC Cluster […]

130,000 Miles

Just the other day, while driving back from a weekend of packing parachutes at Skydive Alabama, my H3 Hummer crossed over the 130,000 mileage mark on the odometer. I think that my H3 has entered it’s proving ground now. This mileage period from now on shows how well built the vehicle really is. With a goal of 250,000 on the odometer, I want to reflect back on the vehicles performance so far. While I wish I had more power from the engine, the 3.5 L (211 CID) L52 I5 has never let me down in all those miles. The body feels completely solid, despite the rust belt’s handy work. And except for the driver side seat, the interior is great. Mike Ditka‘s sons ass is to blame for that one. Anyway, I’ve been worried for years that the damage to the seat in the first 30,000 miles was going to spread. Even though I have been worries, after 100,000 mileage of loving care the seat hasn’t gotten any worse. Despite all the good news, I’ve had needed to replace a few minor parts. Around 60,000 miles, my H3 Hummer’s Radiator Thermostat needed replacing because it would open up too soon. The H3 would run around 25° cooler than what is recommend for the 3.5L L52 I5 engine. After 3 visits to Burning Man and a few rather deep water crossings, the Evaporative Emissions Canister Vent Valve Solenoid gave out. When replacing the Evaporative Emissions Canister Vent Valve Solenoid didn’t come […]

P0455 & P0442 ECU Fault Log H3 Hummer

About year ago my ECU light came on in my H3 Hummer, noticeably after some fun off-road. I grab my cheap Chinese OBD-II to Blue Tooth scanner from eBay, it doesn’t work with Fords, and open the Android application “Torque” . The scanner had no problem grabbing the code and I was able to see the error report in the computer. Fault log report generated by Torque for Android —————— Vehicle VIN: 5GTDN136X68227871 Vehicle Manufacturer: Unknown Vehicle Calibration ID: 12606370 12601134 1260 Current Fault Log —————— P0455: Evaporative Emission Control System Leak Detected (gross leak, check fuel cap, piping etc) P0442: Evaporative Emission Control System Leak Detected (small leak) Pending Fault Log —————— ECU reports no pending faults Historic Fault Log —————— ECU reports no historic faults Other discovered fault codes (possibly pending, current or manufacturer specific) —————————————————- ECU reports no other fault codes logged End of report. After some research I had decided one of two parts had to be giving the ECU the errors, the 20907779 GM Original Equipment Vapor Canister Vent Hose or the 25827646 Fuel Tank Cap. I checked the Fuel Tank Cap over and it looked in great condition, must be the vent hose. Although I ended up buying both parts, because at this point I’m tired of having the engine light on. The day when the parts got delivered to my door, I didn’t have time to install the Vapor Canister Vent Hose. But I was able to quickly put the new Fuel Tank […]

H3 Crash Testing

I happened upon some great video of the H3 Hummer getting it’s IIHS Rating and thought these two videos were to good to pass up.  However, now I’m a bit worried that the IIHS doesn’t quite have the grasp on their job as I once thought. Any true vehicle enthusiast knows the exact motor the vehicle has in it, especially if it’s something weird, but apparently IIHS doesn’t. They have the H3 Hummer listed as an 3.7L V6, when clearly the motor is actually an inline 5-cylinder motor. The tests are only done on 2008+ H3 Hummer models, and you can tell because anything prior 2008+ doesn’t have side impact airbag curtains. That part is nothing special, but when you consider that a 2006 and 2009 have the exact same rating I’m a little bit confused. Anyway, no point in continuing to talking when your most likely here to see the H3 Hummer crash into something.    

Lifting the H3 Hummer

Factory ground clearance on a H3 Hummer is less than ideal at 10 1/2 inches, which is why it constantly gets hung up on the cross-members and looks like a turtle. I was disappointed, to say the least, when I realized just how far I had step backwards with my H3 Hummer compared to my previous vehicle. The feeling is a terrible one, but I know in my heart that not enough work has been done yet to the H3 Hummer before I will throw in the towel. The first step to gaining better ground clearance with the H3 Hummer is bigger tires. Normally this is the second step for most most vehicles. However from the factory, the H3 Hummer can fit massive 315/75r16 tires with out any problems. I personally can’t find a single good reason to go any bigger than 35 inch tires. So I choose to go with General Grabber Red Letter 315/75r16 tires this time around because I wanted a tire that was more road friendly than my past choices. While these tires aren’t the quietest tires at this size, I feel that they a great compromise between on road driving and great off-road performance. Next up is to raise the front-end of the Hummer up by tightening the bolt on the torsion bars underneath. The best part is that this costs nothing to do, however the Hummer will need an alignment to correct the steering geometry. Some companies like to offer “torsion keys” when cranking […]

H3 Hummer 35″ Tires

Ever since H3 Hummer obsession took hold of me, I have seen many people visit my site searching what’s the biggest tires a H3 Hummer can fit and whether or not it is possible to put 35 inch tires on a H3 Hummer. The answer is surprisingly, “Yes, thirty five inch tires will fit on a H3 Hummer that is completely factory.” Even the factory tire mount on the tailgate will fit a 35″ tire just fine. There are however few things to know when mounting tires that big on the H3, but over all it is completely worth it. The biggest tire that will fit without any modification to the vehicle is 315/75r16 which is 34.6 inches tall and about 11 inches wide. Even though the tires are only 34.6 inches at the tallest, they are considered 35’s in the off-road world. The tire I decided to go with is the General Grabber 315/75r16 because I wanted a tire that was aggressive, but had relatively no impact on tire noise, gas mileage, and high speed handling when compared to the factory tires. To my surprise, when I finally came face to face with the tires I found them to be more aggressive than I had expected. However, while they are more aggressive than I was expecting, I have had my expectations for the tires exceeded. The road noise isn’t an issue, gas mileage seems to be right on, and while they handle differently it is only because of the […]

High Clearance Redesign

The other day I sold out of my High Clearance Leaf Spring Mounts for the H3 Hummer, which makes me proud to say that I’m actually starting to make a business out of building off-road parts. Since I’m completely out of them at this moment I have decided to redesign them a bit so that they can be assembled with more precision when I welding. The main reason for this is to reduce the amount of time it takes for me to assemble them, but also to have a finished product that is esthetically more pleaseing to the eye. The redesign should also have the add benefit of making the leaf spring mounts even stronger than before. Of course there is no need for them to be any stronger, but why not I figure. Getting a bit off topic, but if you happen to purchase a set of High Clearance Leaf Spring Mounts from me I recommend that you also purchase 2″ Extended Shackles too. The extended shackles bring the shock back to nearly factory specifications, giving the full range of articulation that GM intend for it and reducing the chance of bottoming out the shock which can cause damage. Enjoy some teaser photos of the new design coming.

My H3 Hummer

About a month ago I finally managed to sell everything and purchase myself an ’06 H3 Hummer with only 41,000 Miles on the odometer. My Hummer has both the Adventure and Luxury packages, which means I have heated leather seats, a sunroof, the monsoon premium sound system with a sub-woofer, 4:1 Transfer case, 33 inch tires, and of course the rear locking differential from the factory. The ride is great, the gas miles is about 20 miles / gallon, and the sound system is much better than I though it would be. I also think that there must be some sort of sound-deading or something because the Hummer is incredibly absent of noise a highway speeds. I also found out that the thickness of the steering wheel is not like a normal car, it is much thicker and feels absolutely great in my hands. I’m not sure why or how, but I had SirusXM Satellite Radio for about month free, and when it got turned off I had to have it again. I started by looking up the prices of SirusXM and was immediately disappointed because of the pricing and wasn’t going to purchase it. But after some internet research, I found out that the trick to getting SirusXM at a price I’ll pay for, is to jump from promotion to promotion. To do this, all some one has to do is call in and ask for what ever the promotion they are currently offering, I got six months for […]

H3 Preformance

Update – February 10th, 2013 This post has become dated, and no longer reflects my views now. Defelice Off-Road skid plates are basically non-existent at this point in time. In response to that I have designed my own heavy duty skid plates for the H3 Hummer and sell them at a lower price point. While Defelice’s winch bumper is great, I now know there is room for improvement and have developed a new winch mount that leaves your H3 Hummer front-end looking completely factory, yet hides a winch. The winch will be hidden behind the front grill right on top of the frame rails. This allows for better access to the spool along with an inexpensive price point. I strongly recommend not buying torsion keys lift kits for you H3 Hummer. Torsion key lifts for the H3 Hummer are completely pointless and are not needed at all. I raised the front of my hummer 1.5″ inches by just tightening the bolt on the torsion bars, keep in mind you need a front-end alignment after doing this. Now back to the orignal posts So this post ends my back to back to back posts of the H3 Hummer on how I have become addicted to this SUV. Recapping a bit, the first post “H3 Hummer” was a kind of a emancipation of me from my Jeep where I was cutting all the strings between us. Yesterday, “H3 Specs” was a declaration of all the mistakes I made with the past gover-I-mean-aaa-Jeep and how […]